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Stax Sigma wood mesh housing? - Page 3

post #31 of 107
Quote:
Originally Posted by schorsch View Post

I think they meant if you use the diffuse field equalizers they are kind of semi panoramic.

 

Regards Georg



The Stax Diffuse Field Equalizers are set up for specific phones, generally Lambdas. I believe at least one was made for either an SR3 or SR5, even though this does not show in the Stax History. 

 

The Sigma frequency response is quite different from the Lambdas, arguably more like a DFE and if you were to add such an equalizer to a Sigma you would probably get too much low and mid frequencies.  Of course I haven't tried this so I could be wrong.

post #32 of 107
Thread Starter 

I found the sound congested in the midrange and the bass a little boomy. I tried moving some insulation from the very back and it sounds a whole lot better.

I can't think of anything negative at all. The bass sounds like it has more definition and took the congestion out of the midrange. They still have good

impact in the bass but it is more open actually all the sound is more open.I think I will be able to find a balance where the sound is really nice

Here is a pic they look kind of rough at the moment but you can see what I mean.

 

0315010032a.jpg

post #33 of 107

There were 4 Diffuse Field equalizers

1. The ED-Signature for the then current Stax SR-Signature earspeakers

2. The ED-1 for the Stax SR-Lambda Professional

3. The ED-5 for the SR-5

4. The Stax SRM-Monitor for the Stax SR-Lambda Professional (this one also included an DD-1 and an SRM 1 Mk 2 Professional amplifier in one large chassis)

img001.jpg


Edited by John Buchanan - 3/15/11 at 7:23pm
post #34 of 107

The Stax Sigma frequency response:

SigmaReview79.jpg

post #35 of 107

The Lambda Nova Signature frequency response:

LambdaNovaSig-graph.jpg

post #36 of 107


The Sigma has a folded single piece of thick mineral wool, rather than pieces. It covers every internal surface expect the driver and the earpad surface. You shouldn't be able to see the driver at all unless you look in through the centre of the earpads.

Quote:
Originally Posted by jaycalgary View Post

I found the sound congested in the midrange and the bass a little boomy. I tried moving some insulation from the very back and it sounds a whole lot better.

I can't think of anything negative at all. The bass sounds like it has more definition and took the congestion out of the midrange. They still have good

impact in the bass but it is more open actually all the sound is more open.I think I will be able to find a balance where the sound is really nice

Here is a pic they look kind of rough at the moment but you can see what I mean.

 

0315010032a.jpg


 

 


Edited by John Buchanan - 3/15/11 at 1:22am
post #37 of 107
Quote:
Originally Posted by John Buchanan View Post

The Stax Sigma frequency response:

SigmaReview79.jpg



This certainly illustrates the frequency roll-offs at the high and low end but shows a surprisingly smooth response between about 60 Hz and 1.5 kHz.  You never know about the accuracy of such plots since they can vary a lot depending on measuring techniques but this looks like what I seem to hear with the low Bias Sigma.

 

 My impressions are that both the Sigma Pro and Sigma/404 are better at the extremes.  The new 507 is supposed to be fairly bright.  It could be even better for use in a Sigma housing.

 


Edited by edstrelow - 3/15/11 at 12:37pm
post #38 of 107
Thread Starter 

I am going to get a piece of aluminum and change the plastic pieces behind the earpads. There is coloration and I think it is because of making these pieces out of plastic. Everything else is so open

that I can't think of anywhere else that would cause coloration. I know that the Sigma's are totally insulated and I tried them like that but I do hear quite an improvement having them somewhat open

behind the ear. Is the 407 and the 507 the same drivers?

 

The plastic I had behind the earpads was a big problem. I took me a good while to make new pieces out of quarter inch aluminum but it was necessary. The plastic was flexing and coloring the sound

really bad.  That is why I found improvement by opening up some insulation in the back. Now I have them insulated the way they should be and the sound is pretty good. They are very solid even though

they are very open and that plays a very important part on the overall sound quality in my opinion.


Edited by jaycalgary - 3/18/11 at 10:57pm
post #39 of 107

Yes the 407 and 507 uses the same drivers. The 507s have a better arc assembly and genuine leather pads. I own the 407, but never heard the 507s. But I have read they sound very similar.

post #40 of 107

They appear to use different cables too.   Stax has issued a number of high end cables over the years.  My Sigma/404 uses the 404 cable which is the same as one the 007's.

post #41 of 107

"...if you were to add such an equalizer to a Sigma you would probably get too much low and mid frequencies.  Of course I haven't tried this so I could be wrong."

 

I have tried it and John told me to try it.

 

Personal results:

 

1. With most recordings I like the Lambdas with the ED-1 equalizer better than without (Same with the Signatures)

 

2. With the Sigmas it is 70% without equalizer // 30% with equalizer

 

Regards Georg

post #42 of 107

Interesting comment regarding the low frequencies, as the ED-1 appears to be ruler flat in the low frequencies according to the frequency response graph that I put up a few posts back. I can see all sorts of changes between 400Hz and 15kHz however. Georg and I appear to be the only people with SRM Monitors - they're rare as chicken lips.

post #43 of 107

 

Quote:
they're rare as chicken lips. 

Is that commoner or rarer than hens teeth or rocking-horse moist brown?

post #44 of 107

You're right John:-))

 

I qouted only with "..." So both things got messed:-))

 

The bass gets more defined!

 

But it depends on the recording (technique)  if I like the equalization or not.

 

Wonderful thing to switch the equalizer on OR off.

 

Regards Georg

 

post #45 of 107

Without music, life would be a mistake.

Without knowledge, life would be bliss.

Edited by wink - 3/27/11 at 8:35pm
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